115 lines
3.2 KiB
Python
115 lines
3.2 KiB
Python
"""Currency exchange rate support that comes from fixer.io."""
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from datetime import timedelta
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import logging
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from fixerio import Fixerio
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from fixerio.exceptions import FixerioException
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import voluptuous as vol
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from homeassistant.components.sensor import PLATFORM_SCHEMA
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from homeassistant.const import ATTR_ATTRIBUTION, CONF_API_KEY, CONF_NAME
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import homeassistant.helpers.config_validation as cv
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from homeassistant.helpers.entity import Entity
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_LOGGER = logging.getLogger(__name__)
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ATTR_EXCHANGE_RATE = "Exchange rate"
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ATTR_TARGET = "Target currency"
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ATTRIBUTION = "Data provided by the European Central Bank (ECB)"
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CONF_TARGET = "target"
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DEFAULT_BASE = "USD"
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DEFAULT_NAME = "Exchange rate"
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ICON = "mdi:currency-usd"
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SCAN_INTERVAL = timedelta(days=1)
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PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
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{
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vol.Required(CONF_API_KEY): cv.string,
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vol.Required(CONF_TARGET): cv.string,
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vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
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}
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)
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def setup_platform(hass, config, add_entities, discovery_info=None):
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"""Set up the Fixer.io sensor."""
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api_key = config.get(CONF_API_KEY)
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name = config.get(CONF_NAME)
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target = config.get(CONF_TARGET)
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try:
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Fixerio(symbols=[target], access_key=api_key).latest()
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except FixerioException:
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_LOGGER.error("One of the given currencies is not supported")
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return
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data = ExchangeData(target, api_key)
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add_entities([ExchangeRateSensor(data, name, target)], True)
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class ExchangeRateSensor(Entity):
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"""Representation of a Exchange sensor."""
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def __init__(self, data, name, target):
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"""Initialize the sensor."""
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self.data = data
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self._target = target
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self._name = name
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self._state = None
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@property
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def name(self):
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"""Return the name of the sensor."""
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return self._name
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@property
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def unit_of_measurement(self):
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"""Return the unit of measurement of this entity, if any."""
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return self._target
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@property
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def state(self):
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"""Return the state of the sensor."""
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return self._state
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@property
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def device_state_attributes(self):
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"""Return the state attributes."""
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if self.data.rate is not None:
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return {
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ATTR_ATTRIBUTION: ATTRIBUTION,
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ATTR_EXCHANGE_RATE: self.data.rate["rates"][self._target],
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ATTR_TARGET: self._target,
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}
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@property
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def icon(self):
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"""Return the icon to use in the frontend, if any."""
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return ICON
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def update(self):
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"""Get the latest data and updates the states."""
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self.data.update()
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self._state = round(self.data.rate["rates"][self._target], 3)
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class ExchangeData:
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"""Get the latest data and update the states."""
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def __init__(self, target_currency, api_key):
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"""Initialize the data object."""
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self.api_key = api_key
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self.rate = None
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self.target_currency = target_currency
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self.exchange = Fixerio(symbols=[self.target_currency], access_key=self.api_key)
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def update(self):
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"""Get the latest data from Fixer.io."""
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self.rate = self.exchange.latest()
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